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                # by(C# 參考) **by** 上下文關鍵字用在查詢表達式的 **group** 子句中,用于指定應該如何對返回的項進行分組。有關更多信息,請參見 [group 子句(C# 參考)](https://msdn.microsoft.com/zh-cn/library/bb384063.aspx)。 下面的示例演示如何在 **group** 子句中使用 **by** 上下文關鍵字,以指定按照每個學生姓氏的第一個字母對學生進行分組。 ``` var query = from student in students group student by student.LastName[0]; ``` ## 請參閱 [LINQ 查詢表達式(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/bb397676.aspx)
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